L = 0.8 mm; a = 28; b = 6.4; c = 39 V = 60
Body
usually in a rather tight spiral. Annules near lip
region become narrower until five usually are present on the high conical
lips. Spear
about 26u long with slightly cupped knobs. Dorsal esophageal gland
outlet 10u behind spear. Hemizonid about 2 annules long, anteriorly
adjacent to excretory pore. Spermagonium a prominent feature of the
uterine tract, sometimes containing spermatozoa which have developed therein.
Tail
unusually
long, dorsally arcuate with about 14 ventral annules. Phasmids 7-10 annules
anterior to anus.
Helicotylenchus platyurus is immediately
recognized by the high, conical lip region with 5 annules, elongate, rounded,
dorsally arcuate tail with 14-16 annules and anterior position of phasmids.
Habitat: About roots of cottonwood
an various shrubs on bank of Sioux River 2 miles west of Brookings, South
Dakota.